Harrow.



No. 7||,956. Patented Oct. 28, |902'.

J. J. FURTHMILLER HABROW.

(Application led Mar. 15, 1902.)

(No Model.)

'me Norms Pneus ca, immuun-1c, WASHINGTON. o c.

ATENT IlifEEICE.

JOHN JACOB FURTHMILLER, OF GRAET'IINGER, IOWA.

HARROW.

SPECIFICATIONforming part Of Letters Patent NO. 711,956, dated. October 28, 1 902- Application filed March l5, 1902. Serial No. 98,363. (No model.) i

To @ZZ whom it may concern,.-

Be it known that I, JOHN JACOB FURTH- MILLER, a citizen of theUnited States, residing at Graettinger, in the county of Palo -Alto and State of Iowa, have invented a new and useful Harrow, of which the following is a speciication.

This invention relates generally to harrows and more particularly to certain attachments applicable to dragharrows, whereby the toothed bars can be held at any desired angle; and another object of the invention is to provide a construction whereby one or more of the toothed bars can spring back in case an obstruction is met with, thereby avoiding the breaking of the harrow tooth or bar.

With these objects in View the invention consists in the novel features of construction and combination, all of which will be fully described hereinafter and pointed out in the claims. Y

In the drawings forming part of this specifloation, `Figure l is a perspective view illus-t4 trating my invention. Fig. 2 is a vertical longitudinal section. Fig. 3 is a detail transverse section. Fig. 4. is a'modiied form of spring employed for connecting toothed bararms to the central beam.

In carrying out my invention I employ side beams A, a central beam B, and journaled in said central and side beams are the hori- Zontal toothed bars O, said bars having uprightarms D rigidly connected thereto adjacent to the centralV beam B, and. directly above the central beam B is a supplemental central beam E, having a series of stop-plates E attached thereto and against which the upright arms D are adapted to rest when the harrow-teeth F, carried by the bars O, are in vertical position, and in order to normally hold the teeth in such position I employthe coil-springs G, one end of each spring being connected to the bar E, while the opposite end is connected to the adjacent upright D, the. tension of the spring holding the arm against the stop E. The bar E is supported upon arms E2, and a lever H, pivotally connected at its lower end to one of the toothed bars, is pivotally connected adjacent to its lower end to the bar E and is provided with a thumb-latch vI-I', vthe pawl of which is adapted to engage the toothed segment H2, carried upon the bar E, and by throwing the lever back or forth the bar can be shifted, and when the bar is shifted the inclination of the harrow-teeth will also be shifted, inasmuch as the springs normally hold the upright arms against the angular stops. In case one or more harrow-teeth should meet with an obstruction the spring connected to the upright arm Will yield, permitting the tooth to spring rearwardly, as most clearly illustrated in Fig. 2, and in this manner all danger of breaking the toothed bars is avoided.

Various forms of springs may be employed; and in Fig. 4 I have illustrated several different modifications, it being apparent that any suitable form of spring may be employed which will normally hold the upright arms against angular stops.

- Having thus fully described my invention, what IA claim as new, and desire to lsecure by `Letters Patent, is-

l. A harrow comprising the longitudinal beams, the transverse toothed bars, each having an upright arm attached thereto, a longidinally-movable shifting bar having stops arranged thereon, the upright arms attached to each toothed bar, and adapted to normally rest against the stops upon the shifting bar, means for holding the said arms against the stops, and means for operating the bar, substantially as described.

2. A harrow comprising the longitudinal beams, the transversetoothed bars journaled in the beams, and carrying harrow-teeth, each toothed bar having an upright bar connected thereto adjacent to the center, a longitudinal shifting bar having laterally-projecting stops adapted to engage the upright arms the springs connecting the shifting bar and the lupright arms, and a lever for operating the shifting bar, substantially as described..

JOHN JACOB FURTHMILLER.

Witnesses:

WM. MUELLER, A. H. CHERRY. 

